So, I'd try: Option 3b: 1.03b loader, DSM platform DS3617xs version 6.2.3 (VM must be set to BIOS Firmware), it boot but no network.
When I'd arrive on the boot menu, there four options (who get gone very quickly), there one saying "VMWare" or something, do I need to select that one?
The Proxmox version used in the tutorial is very outdated, I'm using 7.1-7 . I red the tutorial (many times) and because of the difference in the versions, a lot of things are not appealed the sames way. see moved in another section, it is very confusing.